Dyfyniad APA

Ayaaba A, D. P. J. (1977). Biological nitrogen fixation in farming systems of the tropoics. John Wiley & Sons.

Dyfyniad Arddull Chicago

Ayaaba A, Dart P J. Biological Nitrogen Fixation in Farming Systems of the Tropoics. Chichester: John Wiley & Sons, 1977.

Dyfyniad MLA

Ayaaba A, Dart P J. Biological Nitrogen Fixation in Farming Systems of the Tropoics. John Wiley & Sons, 1977.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.